人工林地力衰退现状及防治对策

Land Capability Decline of Plantation and Its Control Strategy

通过对落叶松和杉木等人工林连栽作业引起地力衰退的研究表明 ,生物循环失调 ,栽培技术不当是引起人工林连栽地力衰退的主要原因。人工林地力衰退主要表现为土壤剖面逆向发育 ,土壤理化性质变差 ,有机质和养分状况恶化 ,人工林生产力下降等。指出调整林分结构、保护林下植被 ,营造混交林 ,科学经营是缓解人工林地力下降的重要措施。

The results of study on the land capability decline of continuous cropping of Larix and Cunninghamia lanceolata showed that the imbalance of bio_cycle and improper cultivation technology were the main causes of land capability decline of plantation. The land capability decline had a series of symptoms such as reverse development of soil profile, and the decline of both physical and chemical character, the deterioration of organic matter condition and the productivity decline of the plantation. It was pointed out that adjusting the stand structure, protecting the undergrowth, mixed planting and adopting the scientific management approaches were the main strategies to alleviate the land capability decline of plantation.